Doesn't take long to realize a TGP is mainly a re-direct site.
Some re-direct TGPs will eventually send you to the site that will show what is on the thumbnail pic you are clicking on. Some sites seldom send you to the correct site represented by the thumb while other TGPs are a combination....some thumbs go right to the site shown, others redirect one or more times before sending you to the correct site and other thumbs just keep redirecting you.
I bookmark decent TGPs that use partial re-directs in a folder that is labeled as redirect TGPs.
One method that works with SOME redirect sites is: after clicking (I always use the open in a new window option via the mouse) I hit the stop button on the browser. The originating site's URL is shown first with the destination site's URL following. If the destination URL appears "legitimate" I place the cursor in front of it and backspace, removing the originating site's URL. Punch the enter or go button (I use IE6) and voila', I am usually at the destination site shown in the thumb on the TGP.
The above method works well on the "better" TGP sites and with less effect on the sleezier mostly redirect TGPs that too-often just send you to another TGP.
I also use the Alltheweb pic and video search functions. Using a multitude of search words and terms I have found a lot of good stuff. I especially like the sites that are not for-profit sites.
I've found really nice non-nude and partial nude sites that obviously have few to no links as evidenced by the very low hit numbers on the counter, if present. Some sites appear to have been abandoned and are just sitting there.
Some of the bestest stuff was on sites without a "main" page. All that was at the URL was a page with folders containing pics and vids. I've found a few of these over the years that took hours to wade through!!!!! I didn't bookmark since it was unlikely they would be updated due to the apparent abandonment of said sites.